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This is a simple yet brilliant idea. Now for an analog version...
by southeastern 6y ago
This is a simple yet brilliant idea. Now for an analog version...
- nosmokewhereiam 6y agoYou can put a blacklight on a timer and use multiple pen colors and shades of blacklight.
- hinkley 6y agoYou should be able to illuminate post-its with a color LED and get them to change color. White or metallic gel pen might make an interesting visual too. They also have those glass signboards that you write on with regular or phosphorescent ink.